Don't fuck with Joan Jett. The leather-lovin' singer-songwriter turns 46 this year, and she's come a long way since her prepubescent days with Kim Fowley's all-girl garage band, The Runaways. And if you thought she looked tough in the 1982 video for "I Love Rock N' Roll," you should see her now -- Ms. Jett has turned herself into a lean, mean rocking machine, keeping herself in shape by jogging backstage before shows and doing yoga (she looks like she's been lifting weights, too). She wasn't afraid to get into a confrontation with security at her last Valley show at Fort McDowell Casino in 2003, when guards started pushing people around in the crowd. Visibly angry, she stopped the show, stated, "I can't believe I'm seeing this shit," and ordered security to stop trampling her fans and move the guardrail closer to the stage. The guards smartly complied. Jett's not only kept herself buff, but busy as well, starring as Columbia in the Broadway production of The Rocky Horror Picture Show, hosting a weekly radio show called "Radio Revolution With Joan Jett" on Sirius' Underground Garage channel, producing the debut album by Ohio punk band The Vacancies, and nabbing a spot on Warped Tour '06. So don't ask "where is she now?" Ask "where is she next?"